Create app.py

app.py

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+import streamlit as st
+
+# Streamlit application
+st.title("Sum Calculator")
+
+# Input for user to enter numbers in the specified format
+user_input = st.text_input("Enter numbers to add (e.g., 3+9+12+...):")
+
+# Check if input is provided
+if user_input:
+    try:
+        # Parse the input and calculate the sum
+        numbers = [int(num.strip()) for num in user_input.split("+")]
+        total_sum = sum(numbers)
+        st.write(f"The sum of the numbers is: {total_sum}")
+    except ValueError:
+        st.write("Please enter a valid sequence of numbers separated by '+' signs.")
+else:
+    st.write("Please enter numbers in the format 3+9+12+...")